Second Marriage without divorcing first wife

I have an issue here. My brother married a canadian woman in bangladesh. My sister in law came to canada she applied for family sponsorship  for my brother. when file transferred to bangladesh visa officer refused the application because he thinks is not a genuine marriage. My sister in law submitted appeal and they win in ADR. but same time my brother married another woman  in  bangladesh. So now canadian embassy started to process application again in bangladesh. Do you think if canadian embassy visa officer found that my brother have another wife after first marriage with canadian woman it can be a serious problem or only first marriage will be recognized as legal marriage?

because i read in OP 2 procedureal manual that First marriage will be recognized only if sponsor or applicant have more than one spouses. So with that canadian woman it was first marriage of my brother. Do you think visa officer can refuse his application if he found that my brother also have a second wife after marrying with canadian woman?

Yes he is romantically involved with canadian wife.

So while your brother's wife was fighting in court to win an appeal to SPONSOR him, he just got married!

Isn't this offensive? Does this poor Canadian woman know anything about his second marriage

Clarifications:
Fact of second marriage can and will be "recognized" as a fact; it is not a "legal marriage" (under Canadian law, immigration or otherwise) and thus will not support any official or legal benefits (such as for immigration purposes). Thus, it is recognized as a fact, but not recognized as a legal marriage.

The fact of the second marriage should result in a determination that the first marriage is not genuine, or, has at least broken down and thus is not continuing. This should preclude eligibility to be sponsored by the first, Canadian wife, despite the ADR result (unless that was specifically an issue dealt with at the time of ADR . . . and in which case, they must have examined the allegation that the second relationship rendered the sponsored relationship not genuine and decided to the contrary).

A divorce from the first wife will not cure the lack of a legal marriage to the second for purposes of Canadian law. If the marriage was not legal at the time it was entered into, it remains not legal ("illegal" has the wrong connotation, implying something is against the law, but here it is simply something that is not "legally" recognized).

Ummm a case to brighten up the day. If this does not result in refusal then the whole IRPA needs taring up.